Hair Analysis ... Hair analysis may refer to the chemical analysis of a hair sample, but can also refer to microscopic analysis or comparison ... Chemical hair analysis may be considered for retrospective purposes when blood and urine are no longer expected to contain a particular contaminant, typically a year or less ... Several alternative medicine fields also use various hair analyses for environmental toxicology but these uses are controversial, evolving and not standardized ...

Hair - Social Role - Religious Practices ... Women's hair may be hidden using headscarves, a common part of the hijab in Islam and a symbol of modesty required for certain religious rituals in Orthodox Christianity ... Sikhs have an obligation not to cut hair (a Sikh cutting hair becomes 'apostate' which means fallen from religion) and men keep it tied in a bun on the head, which is then ... Multiple religions, both ancient and contemporary, require or advise one to allow their hair to become dreadlocks, though people also wear them for fashion ...

Drug Test - Types - Hair Testing ... Hair analysis to detect drugs of abuse has been used by court systems in the United States, United Kingdom, Canada, and other countries worldwide ... In the United States, hair testing has been accepted in court cases as forensic evidence following the Frye Rule, the Federal Rules of Evidence, and the Daubert Rule ... As such, hair testing results are legally and scientifically recognized as admissible evidence ...